I have also published tools and results for comparing the blead test suite output between the new and old versions: https://github.com/exodist/blead_stream_diff.
This work has already produced results and found a couple places where
TAP output differed unintentionally, these bugs have all been fixed.

At
this point the punch-list items are largely blocked on external input
from other people who have volunteered to verify my work and findings.